New 2, 4-thiazolidinediones with aryl sulfonylurea moieties 8a–h have been synthesized by condensing various substituted sulfonamides and 5-(isocyanatomethyl) thiazolidino-2, 4- dione 6. The isocyanomethyl thiazolidinedione was obtained by using the Curtius rearrangement, starting from known 2, 4-dioxo-5-thiazolidineacetic acid 4. The newly synthesized compounds 8a–h have been evaluated for the antihyperglycemic activity in ...